Conditions list medically reviewed by George Krucik, MD, MBA
Learn about what causes allergies, the different types of allergies, and how they're treated.
Scarlet fever is an infection that can develop in people who have strep throat. Learn about the symptoms, treatment, complications, and prevention of scarlet fever.
Fifth disease is common in children. It causes a red rash on the arms, legs, and cheeks, and a virus called parvovirus B19 causes it.
Reye's syndrome is a rare condition that strikes without warning. It most often affects children ages 4 to 12 who are recovering from a viral infection.
Porphyrias are rare types of genetic blood disorders in which patients have a defect in heme production, an important part of hemoglobin. Blisters are a sign of…
Dengue fever is a disease that affects much of the tropical region and is caused by one of four dengue viruses. A skin rash between two and five days after the initial…
Infectious mononucleosis, or mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV).
An Addisonian crisis occurs when levels of cortisol suddenly drop. Learn more about an Addisonian crisis, including symptoms, risk factors, and treatment.
Erysipelas is a bacterial infection in the upper layer of the skin. Learn about erysipelas symptoms, causes, treatment, and prevention.
Hookworms are parasites that affect the small intestine and lungs. Read more about the symptoms of this infection and treatment options.
Ebola disease is a rare, often fatal illness. One of its late-stage symptoms is a bleeding rash over the entire body.
Severe acute respiratory syndrome (SARS) is a serious form of viral pneumonia. The virus that causes SARS was first identified in 2003.
Toxic shock syndrome is a rare but serious condition caused by a bacterial infection. Read more about its causes and symptoms and when to see a doctor.
Poliomyelitis, or polio, is a highly contagious disease that is caused by a virus that attacks the body's nervous system.
Typhus is caused by bacteria transmitted by flea, mite, louse, or tick bites. Scratching the bite opens the skin and allows bacteria to enter the bloodstream.
Weil's disease is a severe form of the bacterial infection leptospirosis. Learn how to lower your risk of getting this potentially life-threatening illness.
Learn about the causes and symptoms of the West Nile virus.
Colorado tick fever is a viral infection transmitted through a bite from an infected tick. Learn about Colorado tick fever symptoms, diagnosis, and treatment.
A transfusion reaction is when your body has an adverse response to a blood transfusion. Learn how transfusion reactions occur and how to minimize your risk.
Smallpox is an extremely contagious and deadly virus for which there is no known cure. This disease has been completely eradicated.
This feature is for informational purposes only and should not be used to diagnose. Please consult a healthcare professional if you have health concerns.